The four Democratic mayoral candidates ganged up on Mayor Bloomberg last night for not doing enough to secure the city, in a lackluster debate where there was little disagreement on most issues.

“I don’t think we’re as prepared [for a crisis] as we should be,” declared City Council Speaker Gifford Miller.

He accused Bloomberg of “eviscerating” the Office of Emergency Management, and called for a local homeland-security agency “so we can be sure one person is in charge 24/7.”

Former Bronx Borough President Fernando Ferrer used practically the same language to attack the mayor.

“He’s muddled that single unified command and eviscerated the Office of Emergency Management,” he claimed.

Rep. Anthony Weiner expressed concern that the NYPD has 3,000 fewer cops than in 2001 and that crime is creeping up.

“This is a bad sign,” he said.

And Manhattan Borough President C. Virginia Fields suggested that the city’s employees had to be better prepared to handle mass evacuations.

Bill Cunningham, a Bloomberg campaign strategist, ripped the Dems for being unprepared themselves.

“We’ve had a number of challenges in this city over the last three years and they [city agencies] got the job done,” he said.

The one-hour debate at WNBC-TV’s studios was the second mandated by the Campaign Finance Board and was notable mostly for the candidates’ unwillingness to criticize one another.

At one point, Weiner was the target of a jab by Miller, who mocked Weiner’s plan to closing the city’s $4.4 billion budget gap next year.

“I don’t think when you’re saying you’re going to propose $1.7 billion in cuts and half or a third of that comes from the capital budget and you’re going to finance a tax cut with that, you’re making much sense,” Miller said.

The Democrats also found themselves struggling to respond to a question about why so many voters in their own party – roughly half – appear to be satisfied Bloomberg, a Republican.

Members of a panel of undecided Democrats who watched the face-off with The Post last night didn’t line up behind any of the candidates after the debate, but several said they were now leaning toward Weiner.

“I think it’s fare to say [Weiner] won. He was the most impressive,” said actress Kathryn Burke.

Louis Muniz, a cop from Queens, said, “Weiner seems like the dark horse in this race. He’s the only one with real ideas.”

The panel was least impressed with Ferrer, who is leading in the polls.

“I came here thinking that I would vote for Ferrer . . . but I was just waiting for him to say something with substance the whole time,” said Firas Chamas, who is now tilting toward Miller.

The Democrats debate for the final time tonight on WABC-TV.

Additional reporting by Stephanie Gaskell

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Report card

FERNANDO FERRER

BEST LINE: “The tax hiker in this race isn’t even in this studio. His name is Mike Bloomberg.”

WORST LINE: “We have a high-school dropout rate of more than half.” – A claim Bloomberg has said is grossly exaggerated

RATING: B

No flubs that would jeopardize his frontrunner status, but he hardly set the world on fire

GIFFORD MILLER

BEST LINE: “I don’t have the kind of money to be able to afford the Independence Party’s nomination.” – Dig at Bloomberg courting Lenora Fulani’s party

WORST LINE “Of course, we’re better off than we were four years ago.”

RATING: B

Pitched plans, but needed to do more to knock down Weiner if he wants to get into a runoff

ANTHONY WEINER

BEST LINE “He’s acted like a Republican but hasn’t fought like a New Yorker.” – On Bloomberg

WORST LINE “I was lied to . . . I regret it.” – On his congressional vote for the Iraq war

RATING: B+

Concise, direct answers and humor; targeted message to middle class

C.VIRGINIA FIELDS

BEST LINE “My style is my style”

WORST LINE: “I would start basically with savings, gap closings within agencies.” – On her plans to cut the budget